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Question

Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = <Zn*, ×>?

a.

17

b.

20

c.

38

d.

50

Answer: (b).20

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Q. Which among the following values: 17, 20, 38, and 50, does not have primitive roots in the group G = <Zn*, ×>?